How to collapse and expand devexpress master/detail asp.net gridview-Collection of common programming errors

First assign clientInstanceName to grid as:

When you complete update or delete as you said call grid.CollapseAllDetailRows(); after the operation that you have completed. or on ASPxClientGridView.DetailRowExpanding Event set the expanded detail row visibleindex. check the following code snippet and code as per your requirement.

     
    
    
        var focusedIndex;